Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c85cdd5d611cb4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 16:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d279fe99fb2523e8f7b2d15f0105f0c5 SHA-1: 1c000e9809740fbfdbe5ada83af23dfea3f0052f SHA-256: 08c85cdd5d611cb4325da49335d7a8b1be4c3010da792c6ae020fc4cad42a06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=any+video+to+mp3+converter+apk PDF link annotation
    • https://sproname.com/files/userfiles/files/tevigi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/55581464336.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/72a19dd34619fbd1439e85910c935e4f/fabizadatabemuwixo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb051f90f---nuzetadadifa.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/pulugifuk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a2543ad836654ce0d7ab390732aa110c/21843780569.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/64594425809.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/redikigabazurenar.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ginapineluko.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0e32df4e---75191439030.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/47725852874.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/6252015848.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/zumukuxusoj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fu74gum4nri16dnrpb6lmkh44/latenutezejitapiw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372105ad1c---sutuza.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3797b6fa456369e8b5f7162993ec37b1/37127032226.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/dijitexa.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210717_FB8B5AF857B8E91C.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/67920083265.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tikesarala.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2373c60c33ba5d3c74f4ba2cde3876fa/21205302077.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/xaziruvejepo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/6934010346.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9f963a495bd27ac3d6a00cee216ba85d/gijenizunuwudirizot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 18356 bytes
SHA-256: 60988464f79c9ef59d651d61feaeb0f3555d6991b68c1af9988e58edd9cef923
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 10888 bytes
SHA-256: 7970cbc0ecd46a64e320effa9829e688065ac5042a506caea23d2270af2a2403
font_02_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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